The correct answers are: Documentary evidence is more reliable than oral evidence; Evidence generated by auditors is more reliable than evidence generated within the entity; Original documents are more reliable than photocopies.

ISA 500 Audit evidence states that documentary evidence is more reliable than oral evidence, that evidence generated by auditors (auditor analytical review, for example) is more reliable than evidence generated within the entity (client analytical review, for example), and that original documents are more reliable than photocopies.

ISA 500 Audit evidence also states that evidence obtained from external sources is more reliable than evidence from internal sources and that the quality of evidence obtained from internal sources is affected by the effective operation of accounting and internal control systems.